Your Answer is

Correct Answer is E

Explanation

The SAS congruence theorem means that if the two sides corresponding to two triangles and the included angles between the two sides are congruent, that is, the triangles are congruent. At present, it can be known that the two triangles DC and AB are congruent, and DB It is also a shared side, so it means that if the two sides corresponding to the two triangles and the included angles of the two sides are congruent, that is, the triangles are congruent. At present, it can be known that the two triangles DC and AB are congruent, and DB It is a shared side, so we can prove congruence only when we know ∠1=∠4, so choose E